Geologic units in Gallatin county, Illinois

Shelburn-Patoka Formations undivided (Pennsylvanian (Kasimovian)) at surface, covers 66 % of this area

Shelburn-Patoka Formations undivided.

Carbondale Formation (Pennsylvanian (Moscovian to Kasimovian)) at surface, covers 13 % of this area

Carbondale Formation.

Tradewater Formation (Pennsylvanian (Bashkirian to Moscovian)) at surface, covers 10 % of this area

Tradewater Formation

Bond Formation (Pennsylvanian (Kasimovian)) at surface, covers 9 % of this area

Bond Formation

Caseyville Formation (Pennsylvanian (Bashkirian)) at surface, covers 2 % of this area

Caseyville Formation

Patoka and Shelburn Formations (Pennsylvanian) at surface, covers 1.0 % of this area

Mostly shale and sandstone; also includes thin beds of limestone and coal. WF, top of West Franklin member

Upper Pope Group (Tar Springs Sandstone through Kinkaid Limestone) (Mississippian (Serpukhovian)) at surface, covers 0.1 % of this area

Upper Pope Group (Tar Springs Sandstone through Kinkaid Limestone).

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone) (Mississippian (Visean)) at surface, covers < 0.1 % of this area

Lower Pope Group (Aux Vases Sandstone through Glen Dean Limestone).

New Albany Shale, Blocher Shale, Sylamore Sandstone, Selmier Shale, Sweetland Creek Shale, Grassy Creek Shale, Saverton Shale, and Louisiana Limestone (Middle Devonian (Givetian) to Upper Devonian (Fammenian)) at surface, covers < 0.1 % of this area

New Albany Shale, Blocher Shale, Sylamore Sandstone, Selmier Shale, Sweetland Creek Shale, Grassy Creek Shale, Saverton Shale, and Louisiana Limestone.